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Interim Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Common stock, shares authorized (in shares) 810,000,000 810,000,000
Common stock , par value (USD per share) $ 0.01 $ 0.01
Common stock, shares Issued (in shares) 185,903,112 185,343,034
Common stock, shares outstanding (in shares) 178,537,554 182,956,628
Treasury stock (in shares) 7,365,558 2,386,406